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首页> 外文期刊>Journal of Systematic Palaeontology >The postcranial skeleton of Ennatosaurus tecton (Synapsida, Caseidae)
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The postcranial skeleton of Ennatosaurus tecton (Synapsida, Caseidae)

机译：纳豆龙的后颅骨骨架（Synapsida，Caseidae）

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摘要

The postcranial material referable to the Russian caseid Ennatosaurus tecton from the middle Permian is described. Although the cranium has been recently restudied in detail, the descriptions currently available for the postcranial skeleton are essentially limited to the original short account on the holotype provided by Efremov in 1956. The postcranium of Ennatosaurus is informative with respect to both taxonomy and phylogeny, with autapomorphic characters present particularly in the vertebral column. In addition to the anatomical description of the elements presented here, eight principal component analyses were conducted to investigate the position of the various osteological elements of Ennatosaurus within caseid morphospace. The inclusion of members of all major groups of 'pelycosaurs' and selected outgroup taxa allowed us to make more extensive preliminary inferences regarding postcranial morphospace occupation of these basal synapsids for each individually considered bone. The analysis revealed a major decoupling among the morphospaces of stylopodial and zeugopodial elements, with femora and humeri showing a shared common pattern, and a wider overlap in their respective morphospace. Conversely, the ulnae, radii, tibiae and fibulae show well-separated regions of morphospace in the different clades, indicating their potential importance, not only for functional and biomechanical studies, but also for taxonomic differentiation. Finally, a 3D photogrammetric model of the mounted specimen at the Paleontological Institute in Moscow forms the basis for the first in vivo reconstruction of Ennatosaurus tecton, providing a potentially realistic picture of the Russian caseid in life.
机译：描述了从中二叠纪起可参考俄罗斯干酪类Ennatosaurus tecton的颅后材料。尽管最近对颅骨进行了详细的重新研究，但目前对颅后骨骼的描述基本上仅限于Efremov在1956年提供的有关原型的原始简短说明。鼻龙的颅骨在分类学和系统发育方面都具有丰富的信息，包括自发形特征特别存在于椎骨柱中。除了此处介绍的元素的解剖学描述外，还进行了八种主要成分分析，以调查肠龙在干酪样形态空间内各种骨骼学元素的位置。所有主要的“ peaucosaurs”和选定的外群类群的成员的纳入使我们能够针对每个单独考虑的骨骼对这些基底突触的颅后形态空间占用做出更广泛的初步推断。分析显示，在虎足类和猴足类的形态空间之间存在主要的脱钩，股骨和肱骨表现出共同的模式，并且在各自的形态空间中有更广泛的重叠。相反，尺骨，骨，胫骨和腓骨在不同进化枝中显示出形态空间的良好分隔区域，表明它们的潜在重要性，不仅对于功能和生物力学研究，而且对于分类学分化也是如此。最后，在莫斯科古生物学研究所，对已安装标本进行3D摄影测量模型，为首次对Ennatosaurus tecton进行活体内重建奠定了基础，从而提供了俄罗斯干酪类生物的真实写照。

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  • 来源
    《Journal of Systematic Palaeontology》 |2018年第15期|1097-1122|共26页
  • 作者

    Marco Romano; Neil Brocklehurst; Joerg Froebisch;

  • 作者单位

    Museum fuer Naturkunde, Leibniz-Institut fuer Evolutions- und Biodiversitaetsforschung, Invalidenstrasse 43, Berlin, Germany,Dipartimento di Scienze della Terra, Sapienza Universita di Roma, Piazzale Aldo Moro 5, 00185 Rome, Italy;

    Museum fuer Naturkunde, Leibniz-Institut fuer Evolutions- und Biodiversitaetsforschung, Invalidenstrasse 43, Berlin, Germany;

    Museum fuer Naturkunde, Leibniz-Institut fuer Evolutions- und Biodiversitaetsforschung, Invalidenstrasse 43, Berlin, Germany,Institut fur Biologie, Humboldt-Universitaet zu Berlin, Invalidenstrasse 42, Berlin, Germany;

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  • 正文语种 eng
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  • 关键词

    Synapsida; Permian; morphospace; principal component analysis; postcranium; Caseidae;

    机译：突触;二叠纪形态空间主成分分析后颅骨科;

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